sd-netlink: constify parameters in public api and adjust pointer formatting

In the internal api, 'char* const*' is used instead of 'const char* const*'
because otherwise we'd get a mismatch with the various strv apis.

src/libsystemd/sd-netlink/netlink-message.c

@@ -256,7 +256,7 @@ _public_ int sd_netlink_message_append_string(sd_netlink_message *m, uint16_t at
         return 0;
 }
 
-_public_ int sd_netlink_message_append_strv(sd_netlink_message *m, uint16_t attr_type, char * const *data) {
+_public_ int sd_netlink_message_append_strv(sd_netlink_message *m, uint16_t attr_type, const char* const *data) {
         size_t length, size;
         int r;
 

src/libsystemd/sd-netlink/netlink-util.c

@@ -187,7 +187,12 @@ int rtnl_get_link_alternative_names(sd_netlink **rtnl, int ifindex, char ***ret)
         return 0;
 }
 
-static int rtnl_update_link_alternative_names(sd_netlink **rtnl, uint16_t nlmsg_type, int ifindex, char * const *alternative_names) {
+static int rtnl_update_link_alternative_names(
+                sd_netlink **rtnl,
+                uint16_t nlmsg_type,
+                int ifindex,
+                char* const *alternative_names) {
+
         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *message = NULL;
         int r;
 
@@ -212,7 +217,7 @@ static int rtnl_update_link_alternative_names(sd_netlink **rtnl, uint16_t nlmsg_
         if (r < 0)
                 return r;
 
-        r = sd_netlink_message_append_strv(message, IFLA_ALT_IFNAME, alternative_names);
+        r = sd_netlink_message_append_strv(message, IFLA_ALT_IFNAME, (const char**) alternative_names);
         if (r < 0)
                 return r;
 
@@ -227,15 +232,19 @@ static int rtnl_update_link_alternative_names(sd_netlink **rtnl, uint16_t nlmsg_
         return 0;
 }
 
-int rtnl_set_link_alternative_names(sd_netlink **rtnl, int ifindex, char * const *alternative_names) {
+int rtnl_set_link_alternative_names(sd_netlink **rtnl, int ifindex, char* const *alternative_names) {
         return rtnl_update_link_alternative_names(rtnl, RTM_NEWLINKPROP, ifindex, alternative_names);
 }
 
-int rtnl_delete_link_alternative_names(sd_netlink **rtnl, int ifindex, char * const *alternative_names) {
+int rtnl_delete_link_alternative_names(sd_netlink **rtnl, int ifindex, char* const *alternative_names) {
         return rtnl_update_link_alternative_names(rtnl, RTM_DELLINKPROP, ifindex, alternative_names);
 }
 
-int rtnl_set_link_alternative_names_by_ifname(sd_netlink **rtnl, const char *ifname, char * const *alternative_names) {
+int rtnl_set_link_alternative_names_by_ifname(
+                sd_netlink **rtnl,
+                const char *ifname,
+                char* const *alternative_names) {
+
         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *message = NULL;
         int r;
 
@@ -263,7 +272,7 @@ int rtnl_set_link_alternative_names_by_ifname(sd_netlink **rtnl, const char *ifn
         if (r < 0)
                 return r;
 
-        r = sd_netlink_message_append_strv(message, IFLA_ALT_IFNAME, alternative_names);
+        r = sd_netlink_message_append_strv(message, IFLA_ALT_IFNAME, (const char**) alternative_names);
         if (r < 0)
                 return r;
 

src/libsystemd/sd-netlink/netlink-util.h

@@ -42,9 +42,9 @@ int rtnl_set_link_properties(
                 uint32_t gso_max_size,
                 size_t gso_max_segments);
 int rtnl_get_link_alternative_names(sd_netlink **rtnl, int ifindex, char ***ret);
-int rtnl_set_link_alternative_names(sd_netlink **rtnl, int ifindex, char * const *alternative_names);
-int rtnl_set_link_alternative_names_by_ifname(sd_netlink **rtnl, const char *ifname, char * const *alternative_names);
-int rtnl_delete_link_alternative_names(sd_netlink **rtnl, int ifindex, char * const *alternative_names);
+int rtnl_set_link_alternative_names(sd_netlink **rtnl, int ifindex, char* const *alternative_names);
+int rtnl_set_link_alternative_names_by_ifname(sd_netlink **rtnl, const char *ifname, char* const *alternative_names);
+int rtnl_delete_link_alternative_names(sd_netlink **rtnl, int ifindex, char* const *alternative_names);
 int rtnl_resolve_link_alternative_name(sd_netlink **rtnl, const char *name, char **ret);
 int rtnl_resolve_ifname(sd_netlink **rtnl, const char *name);
 int rtnl_resolve_interface(sd_netlink **rtnl, const char *name);

src/libsystemd/sd-netlink/sd-netlink.c

@@ -947,7 +947,7 @@ _public_ int sd_netlink_add_match(
                                           destroy_callback, userdata, description);
 }
 
-_public_ int sd_netlink_attach_filter(sd_netlink *nl, size_t len, struct sock_filter *filter) {
+_public_ int sd_netlink_attach_filter(sd_netlink *nl, size_t len, const struct sock_filter *filter) {
         assert_return(nl, -EINVAL);
         assert_return(len == 0 || filter, -EINVAL);
 
@@ -955,7 +955,7 @@ _public_ int sd_netlink_attach_filter(sd_netlink *nl, size_t len, struct sock_fi
                        len == 0 ? SO_DETACH_FILTER : SO_ATTACH_FILTER,
                        &(struct sock_fprog) {
                                .len = len,
-                               .filter = filter,
+                               .filter = (struct sock_filter*) filter,
                        }, sizeof(struct sock_fprog)) < 0)
                 return -errno;
 

src/libsystemd/sd-netlink/test-netlink.c

@@ -572,7 +572,7 @@ static void test_strv(sd_netlink *rtnl) {
         }
 
         assert_se(sd_netlink_message_open_container(m, IFLA_PROP_LIST) >= 0);
-        assert_se(sd_netlink_message_append_strv(m, IFLA_ALT_IFNAME, names_in) >= 0);
+        assert_se(sd_netlink_message_append_strv(m, IFLA_ALT_IFNAME, (const char**) names_in) >= 0);
         assert_se(sd_netlink_message_close_container(m) >= 0);
 
         message_seal(m);

src/systemd/sd-netlink.h

@@ -68,11 +68,11 @@ int sd_netlink_add_match(sd_netlink *nl, sd_netlink_slot **ret_slot, uint16_t ma
 
 int sd_netlink_attach_event(sd_netlink *nl, sd_event *e, int64_t priority);
 int sd_netlink_detach_event(sd_netlink *nl);
-int sd_netlink_attach_filter(sd_netlink *nl, size_t len, struct sock_filter *filter);
+int sd_netlink_attach_filter(sd_netlink *nl, size_t len, const struct sock_filter *filter);
 
 /* message */
 int sd_netlink_message_append_string(sd_netlink_message *m, uint16_t attr_type, const char *data);
-int sd_netlink_message_append_strv(sd_netlink_message *m, uint16_t attr_type, char * const *data);
+int sd_netlink_message_append_strv(sd_netlink_message *m, uint16_t attr_type, const char* const *data);
 int sd_netlink_message_append_flag(sd_netlink_message *m, uint16_t attr_type);
 int sd_netlink_message_append_u8(sd_netlink_message *m, uint16_t attr_type, uint8_t data);
 int sd_netlink_message_append_u16(sd_netlink_message *m, uint16_t attr_type, uint16_t data);